Fnirsi DST-201 3-in-1 Handheld Digital Multimeter with Oscilloscope and Signal Generator

The Fnirsi DST-201 is a versatile 3-in-1 handheld testing device that integrates a True RMS digital multimeter, a portable oscilloscope, and a DDS signal generator into a single compact unit. This multifunctional tool is designed to provide comprehensive diagnostic capabilities for electronics technicians and hobbyists, allowing for real-time waveform monitoring, precise electrical measurements, and active circuit testing in a mobile format.

Advantages

The device stands out by offering a real-time waveform view that is typically absent in standard multimeters, enabling users to visualize signal behavior directly on the screen. With its 1 MHz bandwidth and 5 MSa/s sampling rate, the integrated oscilloscope captures transient events, spikes, and jitter with high clarity. The inclusion of a DDS signal generator with 13 selectable waveforms allows for active testing of amplifiers and filters without the need for additional equipment. Furthermore, the True RMS multimeter ensures accurate readings even with distorted signals, while the 2.8-inch color TFT display provides excellent visibility in various lighting conditions, supported by a long-lasting 3000 mAh battery.

Suitable for

• Electronics diagnostics and troubleshooting
• Automotive electronics repair
• Testing and tuning of audio equipment and filters
• Monitoring power supply stability
• Field service and laboratory circuit analysis

When it may not be suitable

This device is intended for general electronics and low-voltage applications. It may not be suitable for high-voltage industrial power distribution systems or high-frequency RF engineering where specialized, high-bandwidth laboratory equipment is required.

Key specifications

• Display: 2.8-inch color TFT with day and night modes
• Multimeter resolution: 19,999 counts
• Oscilloscope bandwidth: 1 MHz with 5 MSa/s sampling
• Signal generator: DDS type, 13 waveforms, 0–10 kHz range
• Voltage range: Up to 1000 V DC and 750 V AC
• Current range: Up to 9.999 A AC/DC
• Power: 3000 mAh rechargeable battery with USB-C charging

How to use

To begin, charge the device using the provided USB-C cable. Select the desired function—multimeter, oscilloscope, or signal generator—using the intuitive function knob and physical buttons. For multimeter tasks, connect the test leads to the appropriate ports and select the measurement mode. When using the oscilloscope, connect the probe to the signal source and adjust the trigger and time base settings to stabilize the waveform. For signal generation, configure the waveform type, frequency, and amplitude in the generator menu before connecting to your circuit.

What to consider before purchase

• Ensure the 1 MHz bandwidth is sufficient for your specific signal analysis needs.
• Verify that the maximum voltage and current ratings meet your safety requirements.
• Consider the portability benefits against the limitations of a handheld form factor compared to benchtop units.

Usage recommendations: Always inspect the test leads and probes for damage before use. Utilize the silicone protective cover to prevent impact damage during field work, and remember to use the auto-off feature to preserve battery life during extended sessions.